diff --git a/Gemfile b/Gemfile
index 7bc6a56..bb5ae68 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem 'sequel_enum'
 gem 'sequel-seed'
 gem 'dry-transaction'
 gem 'pg'
-gem 'puma', '4.2.0'
+gem 'puma', '4.3.11'
 gem 'mime-types', require: 'mime/types/full'
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 1050128..00cc7c1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,7 @@ GEM
     mustermann-grape (1.0.0)
       mustermann (~> 1.0.0)
     nenv (0.3.0)
-    nio4r (2.5.1)
+    nio4r (2.5.8)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -105,7 +105,7 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (4.2.0)
+    puma (4.3.11)
       nio4r (~> 2.0)
     rack (2.0.7)
     rack-accept (0.4.5)
@@ -173,7 +173,7 @@ DEPENDENCIES
   mime-types
   pg
   pry
-  puma (= 4.2.0)
+  puma (= 4.3.11)
   rack-cors
   rake
   rspec